Who would have thought that a little sister could be soo annoying? Celestia decides to have some fun with Luna and play a tiny prank. A bunch of pies in the face couldn't possibly be so bad, could it? Unfortunately, that plan backfires on her as Luna seeks revenge, starting at one place. Celestia's office.
It was just a prank, bro
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I would do the same if I saw an enormous hole in my wall.